Stuck in 3rd

By motodaddycn, Posted September 27, 2006

Well I just got back from a fun day up in the mountains, UNTIL.... was going up a slimey climb and dumped it over and when I got back up my bike wouldn't shift anymore... it seems to stuck in 3rd (I think) so I had to clutch my way back to the truck... not to fun on some of those climbs.

Anyway I haven't tore into it yet as I just got home, but this is new territory for me so I'm looking for wisdom from the vast knowledge base here... as I said it seems stuck in 3rd, the shifter will move down but nothing happens. The shifter won't shift up though, I fiddled around awhile and got it into neutral once but nothing now...

I'm GUESSING the shift fork??? I know it's not going to be pretty but I want to get on this as I'm not ready to pack it in for the winter yet!!

Any help would be appreciated, I'm not the most experienced mechanic but once pointed in the right direction I can usually hash it out.

Thanks

By VETMX808, Posted September 27, 2006

I really don't see that as a problem...that is the only gear I use!

Sorry could not resist...anyway, I would think it would be either the detent bolt, which has been a fairly easy fix. Do a search or look at the FAQ thread, it may answer your question...

By motodaddycn, Posted September 28, 2006

Good point... but I still like the rest "just in case"

So anyway I tore it apart and the "shift lever" at the clutch side of the "shift bolt" is broken to crap... looks like it must have landed on the shifter and impacted it enough to stress the lever.

I wonder if it's been a cumulation thing as it did seem to be shifting a bit harder recently now that I think about it??

Hey So let me give you the background of my bike so I can rule out all possibilities.—it is a 2006 kx450f I just recently rebuilt the whole engine Crank/bearings/rod/piston/valves and the head got beat up by a dropped valve so I sent that away for repair. So basically the engine is %100 new. I rode it 4-5 time a total of 10-15 hours since ALL of that work…Now to the problem---
On my last ride I had white smoke while riding and it shut off. turned out to be coolant in my oil.
So far the only thing Ive changed is the water pump gasket on the outside. I though it might be the head, i.e a crack so I did a compression test and got VERY low readings. Every time I did it, it was BELOW 50 PSI but It holds it does not leak. What else could this be??
Maybe multiple things?
Cases not seal right?
Piston rings?
Head gasket installed incorrectly?
HELPPPPPPPPP!!